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LTC6261/LTC6262/LTC6263

626123fa

For more information www.linear.com/LTC6261

typicAl ApplicAtions

1VP-P

10µs/Div

1.0

1.5

2.0

2.5

3.0

3.5

4.0

626123 TA10

Butterworth Filter Response

The frequency response shows an expected roll-off of

three poles, an extended plateau, and a sharp roll-off; the

transient response includes a small amount of ringing.

BRIDGE-TIED DIFFERENTIAL OUTPUT AMPLIFIER

The low supply current at the bandwidth and noise per-

formance allows for excellent fidelity at a fraction of the

usual dissipation in portable audio equipment.

LTC6261

4.99k

1nF

100pF

4.99k

RSPEAKER

120

4.7

10k

4.7

10k

15k

10µF

VINV1

VIN

VINV2

NOISE FILTER

GAIN STAGE, OUTPUT DRIVE

INVERSION STAGE, OUTPUT DRIVE

AC COUPLED INPUT

626123 TA11

LTC6261

Audio Headphones Bridge Driver

Headphonespeakerimpedancesrangefrom32Ωto300Ω;

their responsivity, from 80dB to 100dB SPL per 1mW and

beyond. As an example, considering a headphone speaker

with90dBSPLper1mW,ittakes100mWtoreach110dBSPL.

With 32Ω, the RMS current is 56mA and voltage 1.8V; with

120Ω, 29mA and 3.5V.

Given a 3.3V supply and the output of one LTC6261 am-

plifier there may not be sufficient drive capability to yield

100mW. However, the combination of two 180 degree

phased amplifiers is enough to provide the necessary

drive voltage or current to reach upwards of 100mW.

Duplication of this bridge drive circuit enables power to

both left and right sides.

TheLTC6263providesfouramplifiersinonesmallpackage.

Data from a two-amplifier LTC6262 driving what could be

Left or Right is shown below. Basic current consumption

of the two amplifiers, with as much as 1VP-P input but no

load, is 500µA.

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